T89C51CC02CA-RATIM datasheet(90/156 Pages) ATMEL

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AT/T89C51CC02

4126J–CAN–05/06

CAN Autobaud and

Listening Mode

To activate the Autobaud feature, the AUTOBAUD bit in the CANGCON register must

be set. In this mode, the CAN controller is only listening to the line without acknowledg-

ing the received messages. It cannot send any message. The error flags are updated.

The bit timing can be adjusted until no error occurs (good configuration find).

In this mode, the error counters are frozen.

To go back to the standard mode, the AUTOBAUD bit must be cleared.

Figure 45. Autobaud Mode

Routine Examples

1. Init of CAN macro

// Reset the CAN macro

CANGCON = 01h;

// Disable CAN interrupts

ECAN

= 0;

ETIM

= 0;

// Init the Mailbox

for num_page =0; num_page <4; num_page++

{

CANPAGE = num_channel << 4;

CANCONCH = 00h

CANSTCH = 00h;

CANIDT1 = 00h;

CANIDT2 = 00h;

CANIDT3 = 00h;

CANIDT4 = 00h;

CANIDM1 = 00h;

CANIDM2 = 00h;

CANIDM3 = 00h;

CANIDM4 = 00h;

for num_data =0; num_data <8; num_data++)

{

CANMSG = 00h;

}

// Configure the bit timing

CANBT1 = xxh

CANBT2 = xxh

CANBT3 = xxh

TxDC

RxDC

AUTOBAUD

CANGCON.3

RxDC

TxDC

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